why is my crocea over extending

reefsafe

Premium Member
4 inch crocea at the top of the tank-about 4 inches from the surface of a 90 gallon. My lighting - 2 x 150 watt MH, 2 x130 watt compacts, 1x 54 watt T5. ANy thoughts? I can't move it any higher.
 
wife has the camera. i have compared it to the other threads about overextending and it is similar to those clams that were overextending.
 
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